Research On The Influence Of Blade Fouling On Axial Compressor Performance

Axial compressor has been widely used in civil aviation industry,whose performance is directly related to safety and benefits in civil aviation.During engine’s operations,a large number of foreign contaminants enter into compressor with inspiratory air and adhere to compressor’s wall,which increases surface roughness and changes blade profile parameters,this will cause compressor operate under off-design condition,along with compressor’s total aerodynamic performance deterioration and variation of blade structure performance.Therefore,there is a big practical value to study the variations of compressor’s internal flow field,compressor’s aerodynamic performance parameters and blade structural performance like static strength and modal.Based on the original profile and flow path data of Stage 36 published by NASA,a model of typically actual single-stage compressor is created using Workbench blade design module named Blade Gen,after finishing fluid computation in CFX with SST k-ω turbulence model chosen,the feasibility of numerical model is conducted by comparing simulation results and published experiment results.In terms of studying the influence of fouling on compressor’s aerodynamic performance and fluid flow,it aims to study the influence of blade fouling by adding blade surface roughness and blade normal thickness,it involves two different adding roughness levels and two different adding thickness levels and some combinations of them.The results show that adding wall roughness significantly reduces axial compressor stage’s total pressure ratio and adiabatic efficiency,while adding thickness decreases mass flow greatly,meanwhile,blade fouling increases compressor’s loss and decreases its capability of generating head.Based on the results of finished fluid calculations,it conducts a series of structural analysis and modal analysis for blades under different fouling conditions by using one-way fluid-structure interaction,and two useful methods are proposed so as to deal with adding geometry of fouling,it obtains the variations of stress,deformation and modal before and after fouling under four different working conditions.The results show that under same outlet pressure condition,blade fouling will increase blade’s maximum stress and adding thickness will decrease blade’s mode frequency.